如何在 RSpec 测试中禁用 MySQL 唯一约束 [英] How can I disable MySQL unique constraints in a RSpec test

问题描述

我正在尝试为一个脚本运行规范，该脚本将统一给定的表.

I'm trying to run a spec for a script that will uniquify a given table.

我现在在迁移中有独特的约束，所以我很难创建重复项来测试我的脚本.

I now have the unique constraints in my migrations so I'm having a hard time creating duplicates to test my script.

我目前的规格是这样的.

My current specs looks like that.

require 'spec_helper'

describe OneTime::UniquifyTypeDescriptorContext do

  before(:each) do
    duplicated_type_descriptor_contexts = FactoryGirl.build_list(:type_descriptor_context, 5, {:type_name => :foo})
    ActiveRecord::Base.connection.execute('SET unique_checks=0;')
    duplicated_type_descriptor_contexts.each{|tdc| tdc.save!(:validate => false)}
    ActiveRecord::Base.connection.execute('SET unique_checks=1;')
    FactoryGirl.create(:type_descriptor_context, :type_name => :bar)
  end

  context "#process!" do
    it "should remove duplicates" do
      OneTime::UniquifyTypeDescriptorContext.new.process!
      expect(TypeDescriptorContext.count).to eq 2
    end
  end
end

但它继续失败

ActiveRecord::RecordNotUnique:
       ActiveRecord::JDBCError: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'foo' for key 'index_type_descriptor_contexts_on_type_name': INSERT INTO `type_descriptor_contexts` (`created_at`, `type_name`, `updated_at`) VALUES ('2015-10-06 18:23:39', 'foo', '2015-10-06 18:23:39')

我错过了什么吗?

推荐答案

可能需要有人确认这一点.

Someone may need to confirm this.

SET unique_checks=0; 不是全局操作.如果你想让它工作，那么你必须这样写:

SET unique_checks=0; is not a global operation. If you'd want this to work then you'd have to write it like that:

ActiveRecord::Base.connection.execute <<-SQL
  SET unique_checks=0;
  INSERT INTO <table_name> VALUES ....
  SET unique_checks=1;
SQL

或者您可以删除唯一索引，创建记录，然后重新创建索引.

Or you could drop the unique index, create the records and re-create the index afterwards.

这篇关于如何在 RSpec 测试中禁用 MySQL 唯一约束的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！